Sharpening device



Filed March 11, 1955 Cb/vw M-A-Ench-es Patented June 9, 1936 UNITED ESTATES PATENT jOFFlCE 3 Claims.

This invention appertains to sharpening devices, and more particularly to a novel device for sharpening the discs of a harrow.

One of the primary objects of my invention is to provide a disc sharpener which can be readily applied to and moved along the harrow for sharpening the entire gang of discs while the harrow is in use.

Another salient object of my invention is the provision of a disc sharpener embodying an operating hand lever having sharpening means on one end thereof for engaging a disc, and a fulcrum stop intermediate its ends for engaging a suitable rigid part of the frame (such as the scraper bar), whereby the operator of the harrow canswing the lever by movement of his hand and bring the sharpening means into intimate contact with a disc edge at the desired pressure, and thus bring about the sharpening of the disc during the rotation thereof.

A further object of my invention is to provide a disc sharpener embodying a manipulating lever having a head on one end thereof provided with a pair of diverging arms, with hardened tool steel sharpening blades clamped thereto at the desired angle for engaging the edge of the disc, the blades being reversible so that a new sharpening edge can be brought into play when one edge becomes dull.

A further important object of my invention is the provision of novel means for releasably clamping the sharpening blades in position, whereby the blades can be quickly removed for re-sharpening on a tool grinder.

A further object of my invention is the provision of novel means for mounting the fulcrum stop on the lever, whereby the position thereof can be readily changed relative to the sharpening knives, so that the device can be easily used on harrows of different makes.

A still further object of my invention is to provide an improved disc sharpener of the above character, which will be durable and efficient in use, one that will be simple and easy tomanufacture, and one which can be placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement, and formation of parts, as will be hereinafter more specifically described, claimed, and illustrated in the accompanying drawing, in which drawing:--

Figure 1 is a fragmentary transverse section through a disc harrow with my improved sharpening device applied thereto.

Figure 2 is a transverse section through the sharpening device taken substantially on the line 2-2 of Figure 1, looking in the direction of the arrows, illustrating the fulcrum stop.

Figure 3 is a fragmentary bottom plan view of 5 the sharpening device, looking in toward the sharpening knives.

Figure 4 is a transverse section through the sharpening device taken substantially on the line 4-4 of Figure 1, looking in the direction of the 10 arrows.

Referring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the several views, the letter H generally indicates a harrow, and S my 15 improved sharpening device.

The harrow can be of any desired size, make, or style, and includes the usual frame 5 for sup porting the shaft 6 on which the harrow discs I are mounted. The frame 5 also supports a bar 8, which supports the depending scrapers 9 for the harrow discs.

My improved sharpening device S comprises a hand lever Ill having an upturned arcuate handle ll formed on the outer end thereof. The lever can be constructed from any desired material, but for the purpose of lightness and strength, the same preferably consists of a length of steel pipe or other tubing.

Rigidly secured to the forward end of the lever It is a head l2 carrying the sharpening means. This head I2 includes a tubular cuff 13, which is welded or otherwise rigidly afiixed to the lever. Depending from the cuff 13 are the forwardly inclined arms M, which are preferably disposed in diverging relation. These arms 14 form supports for the sharpening blades 15 and I6.

These blades are preferably formed from hard tool steel, and they have their opposite ends sharpened, as at H. The blades are laid directly on the arms I4, and can be secured thereto in any desired manner, such as by clamp straps l8, which are bolted to the arms M by bolts l9. This forms a simple and ideal means for securing the blades in place, as not only can the blades be easily removed, but the same can be adjusted in and out.

As shown in Figure 3 of the drawing, one of the blades can be arranged slightly above the other, which also facilitates the positioning and adjusting of the blades.

By having the blades sharpened on each end, the same can be readily reversed when one of the edges becomes dull.

Arranged in spaced relation to the head 12 is the fulcrum stop 20. This stop 20 is in the nature 55 of a sectional clamp for engaging about the lever l0. Thus, each section includes a semicircular body 2| and oppositely extending ears 22 and 23. Bolts 24 extend through the ears of the sections, and the semicylindrical body portions 2| can be brought into firm contact with the lever by said bolts. The ears 22 are formed relatively long and are adapted to engage the scraper bar 8 of the harrow when the sharpener is in use. The fulcrum stop 20 can be adjusted along the lever l toward and away from the head I 2 so that the sharpener can be used on different makes of harrows.

In operation of my improved sharpening device, the harrow is used in the ordinary manner, and the lever is placed below the scraper bar 8, with the handle I I extending upwardly and rearwardly. The head [2 is disposed above the disc to be sharpened, with the blades in contact with the edge of the disc, and the fulcrum stop in engagement with the scraper bar.

As the harrow is moved over the ground, the operator can grasp the handle and swing the lever on the fulcrum stop and bring the blades into engagement with the disc at the desired pressure. When one disc is sharpened, the device can be moved along the scraper bar to the next disc.

From the foregoing description, it can be seen that I have provided an exceptionally simple and durable device for sharpening the discs of harrows, which can be operated by the ordinary layman, and which will not be affected by soil adhering to the discs.

Changes in details may be made without departing from the spirit or the scope of this invention, but what I claim as new is:

1. A sharpening device for the discs of harrows comprising a hand lever, a fulcrum stop on the lever, a head on the forward end of the lever in advance of the stop including an attaching cuff and forwardly and downwardly projecting divergingarms, and removable sharpening blades connected to said arms.

2. A device for sharpening the discs of harrows while the harrow is in use, comprising a hand lever, a fulcrum stop on the lever intermediate the ends thereof for engaging the frame of the harrow, and sharpening means on the forward end of said lever in advance of the fulcrum stop for engaging the harrow discs, said fulcrum stop being movable longitudinally of the lever toward and away from the sharpening means.

3. A device for sharpening discs of harrows while the harrow is in use, comprising an arcuate hand lever including angularly disposed straight portions and a curved connecting portion, a fulcrum stop on one of the straight portions intermediate the ends thereof for engaging the frame of the harrow, and sharpening means on the forward end of the last mentioned straight portion in advance of the fulcrum stop for engaging the harrow discs, the other straight portion of said lever constituting a hand grip.

MICHAEL A. ENDRES. 

